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基于分子相互作用体积模型,结合Sn、Sb的无限稀活度系数γ∞Sn、γ∞Sb,运用牛顿迭代法计算了Sn-Sb合金中Sn、Sb的活度系数γSn、γSb,并预测了Sn-Sb合金中Sb的分离系数βSb,结果表明:βSb>>1,理论上Sn、Sb能够彻底地分离。同时绘制气液相平衡图,理论预测了Sn-Sb合金组元在气液相间的分布情况,并与试验值进行对比,结果表明,当温度为1200~1400℃,平均相对误差S2*=5.86%,理论预测值与试验值吻合较好,研究结果为Sn-Sb合金真空蒸馏分离过程提供了可靠的理论依据。
Based on the molecular interaction volume model and the infinite dilute activity coefficients γ∞Sn and γ∞Sb of Sn and Sb, the activity coefficients γSn and γSb of Sn and Sb in Sn-Sb alloy were calculated by Newton’s iteration method. Sn-Sb alloy Sb separation factor βSb, the results show that: βSb >> 1, in theory, Sn, Sb can be completely separated. At the same time, the equilibrium diagram of gas-liquid phase was plotted. The distribution of Sn-Sb alloy in gas-liquid phase was theoretically predicted and compared with the experimental data. The results show that when the temperature is 1200 ~ 1400 ℃, the average relative error S2 * 5.86%. The theoretical predictions are in good agreement with the experimental values. The results provide a reliable theoretical basis for vacuum distillation of Sn-Sb alloy.